જો $x = \sec \phi - \tan \phi$ અને $y = \csc \phi + \cot \phi$ હોય,તો:

  • A
    $xy + x - y + 1 = 0$
  • B
    $y = \frac{1 + x}{1 - x}$
  • C
    $x = \frac{y - 1}{y + 1}$
  • D
    ઉપરના તમામ

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${\left( \frac{\cos A + \cos B}{\sin A - \sin B} \right)^n} + {\left( \frac{\sin A + \sin B}{\cos A - \cos B} \right)^n}$ ($n$ એ પૂર્ણાંક છે) $=$

જો $x = 3 \sin \theta$,$y = 3 \cos \theta \cos \phi$,અને $z = 3 \cos \theta \sin \phi$ હોય,તો $x^{2} + y^{2} + z^{2} =$

જો $\cos(\theta_1) + \cos(\theta_2) + \cos(\theta_3) + \cos(\theta_4) = -4$ હોય,તો $\cot(\frac{\theta_1}{2}) + \cot(\frac{\theta_2}{2}) + \cot(\frac{\theta_3}{2}) + \cot(\frac{\theta_4}{2})$ ની કિંમત શોધો.

જો $\tan \theta \cdot \tan \left(120^{\circ}-\theta\right) \tan \left(120^{\circ}+\theta\right)=\frac{1}{\sqrt{3}}$ હોય,તો $\theta$ ની કિંમત શોધો.

$\sum_{k=0}^4 \sin^2 \left( (2k+1) \frac{\pi}{20} \right) =$

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